/*! Copyright (c) 2010 Brandon Aaron (http://brandonaaron.net)
 * Licensed under the MIT License (LICENSE.txt).
 *
 * Version 2.1.2
 */

(function ($) {

    $.fn.bgiframe = ($.browser.msie && /msie 6\.0/i.test(navigator.userAgent) ? function (s) {
        s = $.extend({
            top: 'auto', // auto == .currentStyle.borderTopWidth
            left: 'auto', // auto == .currentStyle.borderLeftWidth
            width: 'auto', // auto == offsetWidth
            height: 'auto', // auto == offsetHeight
            opacity: true,
            src: 'javascript:false;'
        }, s);
        var html = '<iframe class="bgiframe"frameborder="0"tabindex="-1"src="' + s.src + '"' +
            'style="display:block;position:absolute;z-index:-1;' +
            (s.opacity !== false ? 'filter:Alpha(Opacity=\'0\');' : '') +
            'top:' + (s.top == 'auto' ? 'expression(((parseInt(this.parentNode.currentStyle.borderTopWidth)||0)*-1)+\'px\')' : prop(s.top)) + ';' +
            'left:' + (s.left == 'auto' ? 'expression(((parseInt(this.parentNode.currentStyle.borderLeftWidth)||0)*-1)+\'px\')' : prop(s.left)) + ';' +
            'width:' + (s.width == 'auto' ? 'expression(this.parentNode.offsetWidth+\'px\')' : prop(s.width)) + ';' +
            'height:' + (s.height == 'auto' ? 'expression(this.parentNode.offsetHeight+\'px\')' : prop(s.height)) + ';' +
            '"/>';
        return this.each(function () {
            if ($(this).children('iframe.bgiframe').length === 0)
                this.insertBefore(document.createElement(html), this.firstChild);
        });
    } : function () {
        return this;
    });

// old alias
    $.fn.bgIframe = $.fn.bgiframe;

    function prop(n) {
        return n && n.constructor === Number ? n + 'px' : n;
    }

})(jQuery);